Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacbbf43aa1a1106…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 03:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 739fd5ebb364ba6512ebf963b67114da SHA-1: e65c87d983007f63979b0323bf3a29e65a793be0 SHA-256: bacbbf43aa1a11068cb3c750448be5df700ac20d8209d9136a3fac623fdc930a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=lost+in+the+jungle+pdf PDF link annotation
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e9cef7d6---49463905583.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/miresojapofaputifazu.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/68285879744.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/zuginifudisibuzoja.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/2054474317.pdfIn PDF document text
    • https://phnews.ro/files/file/97766267723.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/76051152265.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/72589915558.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136be900b866---fezixo.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/72135719510.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/28687676481.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/789e58a517f7e0e87d254c600b6fb8ad/vuteliruruza.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/wadewabenenikurafuxejoge.pdfIn PDF document text
    • https://mfdesign.hu/files/file/14211811433.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b58772accd5bae7cf495f06e0258f1a4/85144163797.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/lekobapedetujekiwebabek.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/lolifokidenafebim.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/58159036282.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210904202842_1263962218.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/48862815693.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161428b051a9a9---14446201428.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/92003852298.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/74187057300.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/pawekonabalu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 10700 bytes
SHA-256: 2193d7f6b30971a75e8790a9c3cb5e6a8af2a4b5ba8cadcfeb5d7d02ac110a7d
font_01_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 18096 bytes
SHA-256: 8ff9084b2d9564eb306c9375abd3cf1003be9a409b362a05b77ba454c12f8009
font_02_sfnt_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1